No, it’s a colloquialism that refers to sedans as large as a boat. Of course boats come in all sizes, but it’s usually referring to something the size of, say,

No, it’s a colloquialism that refers to sedans as large as a boat. Of course boats come in all sizes, but it’s usually referring to something the size of, say, a present-day Chrysler 300 or larger. A truly full-size four-door sedan. Also known as Land Yacht when they are also a luxury sedan: https://en.wikipedia.org/wiki/Land_yacht_(automobile) https://en.wikipedia.org/wiki/Land_yacht_(automobile)